Table 4. Susceptibility test towards different antibiotics of A. xylosoxidans NH44784-1996 and 10 clinical isolates taken from the same patient in the years from 1996 to 2011 and three A. xylosoxidans reference strains DMS2402, DSM6388 and DSM11852.

	Clinical isolates collected at consecutive years from 1996											Reference strains
Antibiotic	0	2	7	7	9	10	11	12	13	14	15	DSM 2402	DSM 6388	DSM 11852
Tobramycin	96	32	96	128	128	256	256	256	256	256	256	256	12	1
Meropenem	0.25	6 (32)	32	32	12 (32)	32	32	8 (32)	32	16 (32)	12 (32)	0.5	0.125	0.016
Ceftazidime	4	4	16	8	16	12	12	8	8	6	8	8	3	0.38
Aztreonam	256	256	256	256	256	256	256	256	256	256	256	256	192	12/256
Piperacillin	1	1.5(12)	3	2	1.5	0.75(3)	2	1.5	1.5	1.5	1.5	1	1	0.125
P+T	0.5	0.75(6)	1.5	1.5	0.75	0.5 (1.5)	2	1	0.75	0.75	0.75	0.5	0.5	0.064
Colistin	12	2	12	2	4	16	3	2	3	3	4	12	12	0.5
Ciprofloxacin	6	16	32	32	32	32	32	32	32	32	32	32	1.5	0.25
T+S	0.47	0.19(12)	3/(32)	10 (32)	3/(32)	3/32	2/(32)	1 (32)	0.38(32)	1 (32)	32	n.t.	n.t.	n.t.
Tetracycline	64	96	256	128	256	256	96	256	256	256	256	n.t.	n.t.	n.t.
Chloramphenicol	64 (256)	256	256	96	256	128 (256)	256	128 (256)	256	256	192	n.t.	n.t.	n.t.

P+T: Piperacillin+Tazobactam, T+S: Trimethoprim+Sulfamethoxacole. Numbers in brackets relate to subpopulations. n.t.: not tested.